I installed calibre back in January and didn't do much with it since most of my reading is on my netbook. But I've got a loaner Sony 505 for a couple of months, and started playing around with calibre a week or so ago and went 'OMG this is wonderful! Now I get why ppl love this program.' When I read the list of changes for version .6 I was really excited about some of them. The list of file formats that it can convert to and from is amazing.